Improvement in chronometer-escapements



C. FASOLDT.

Chronbmetr.

No. 46,652; Patented March 7, 1865.

' UNITED STATES PATENT OFFICE.

CHARLES FASOLDT, OF ALBANY, NEW YORK.

IMPROVEMENT IN CH RONOMETER-ESCAPEMENTS.

Specification forming part of Letters Patent No. 46,652, dated March 7,1865.

To all whom, it may concern.-

Be it known that I, CHARLES FASOLDT, of Albany, in the county of Albanyand State of New York, have invented a new and Improved Escapeinent forOhronometers; and I do hereby declare that the following is a full.clear, and exact description thereof, whirh will enable those skilled inthe art to make and use the same, reference being had to theaccompanying drawings, forming part of this specification, in whichFigure 1 represents a plan of this invention. Figs. 2, 3, and 4 show theescapement in various positions, the several parts being illustrated ina larger scale than the previous figure.

Similar letters of reference indicate corre- 1 spondin g parts.

This invention relates to an improvement on an escapement described inLetters latent granted to me February 1, 1859; and the 1 object of thisinvention is to produce a positive stop of the escape-wheel at eitherend l of the stroke of the balance, while at thel same time an impulseis given to the bal-l ance by the action of the teeth of the lescapewheel on the end of a lever during one-half the stroke of thebalance, the other half of said stroke being completed by the momentumof the balance and by the action of the hair-spring. In order to effectthis purpose I use a double escape wheel, a b, or,

or unequal diameter and mounted on the same shaft. In practice thediameter of the i two escapewheels are unequal, as shown in 1 thedrawing and described in the Letters; Patent above referred to, and theyconnect with the main driving-wheel byatrain of; wheels in the usualmanner. The teeth ofj the smallescape-wheel, to, act on the lever c land impart to the balance an impulse during one half of ils stroke, theother half of the stroke being completed by the momentum of the balanceand the power of the hair-spring. The teeth of the large cscapewheel I)are caught by the pallets d e, which 1 are broughtinto action at theopposite ends of the stroke of the balaneef. These pal-l lever c at thepoint when the balance in s completed its rotation, or nearly so, in thedirection of the arrows marked on it in Figs. 3 and 4. Fig. 3 shows thelever and pallets in the position which they occupy at the beginning ofthe rotation of the balance in the direction of said arrows; and Fig.-.l shows them in the position which they oc cupy when the tooth of thesmall escapewheel is just on the point of clearing the lever c. It thebalance returns and rotates in the direction of the arrow marked on itin Fig. 2, the pallet (6 remains in contact with the tooth of the largeescape-wheel until the motion of the balance in this direction is nearlycompleted, and just before the balance begins to return the position of1 the anchor changes and the pallet 0 drops in front of the tooth of theescape wheel I), thus allowing the escape wheels to turn only averysmall distance during that half of the stroke of the balance. At thatmoment the position of the lever and of the pallets is that shown in Fig3, and the balance begins to rotate in the direction of the arrow markedthereon in said figure, and as soon as this takes place the pallet ereleases the tooth of the wheel I) and the lever c catches in front ofthe tooth of the wheel (1, thereby imparting an impulse to the balancesufficient f to make up for the loss of motion by friction fandresistance of the air. in other words, two escape-wheels of equal Bythis arrangement the pallets are siinp'y used as stops, and the frictionbetween them and the teeth of the escape-wheels has no efiect on themotion of the balance or of the watch. If the teeth oftlie escape-wheelswear ott', the motion of the watch is not ali'ected.

No oil is required to make the escapement work smooth, and the injuriouseffects ot'sucn use are not felt. The watch keeps correct time as wellafter it has been in use for years as it does when new, .and it is notaffected by counter motion or sudden jars.

I claim as new and desire to secure by Letters latent The pallet 0,arranged in combination with 1 the pallet (I, lever 0. wheels a b, andbalance f,

in the manner and for the purpose substantially as herein shown anddescribed.

CHARLES FASOLDT.

Witnesses H. P. NUGENT, THOMAS SILsBY.

